def circle():
　　r=input('please enter the radius of the circle:')
　　area=3.14*r**2
　　return area

def rectangle()：
　　l=input('please enter the length of the rectangle:')
　　w=input('please enter the wide of the rectangle:')
　　area=l*w
　　return area 

def triangle()：
　　l=input('please enter the length of triangle\'s bottm:')
　　h=input('please enter the height of the triangle:')
　　area=0.5*h*l 
　　return area

flag=True
while flag:
　　print ('\n please to select C ,R,T, Q:')
　　Print ('c: circle')
　　print ('R: rectangle')
　　print ('T: triangle')
　　print ('Q: quit')
　　s=raw_input('Please enter the C,T,R,Q)
　　if s=='C' or s=='c'：
　　area=circle()
　　elif s=='R' or s=='r'：
　　area==rectangle()
　　elif s=='T' or s=='t':
　　area==triangle()
　　elif s=='Q' or s=='t'：
　　flag=False
print ['the area is ', circle()]